Process flow for separating acid-insoluble substances in nitric phosphate production by chemical flocculence method

Abstract

The invention discloses a process flow for separating acid-insoluble substances in the nitric phosphate production by a chemical flocculence method, which has the key points that according to the actual condition of the production, a plurality of flocculating settling tanks are arranged; after phosphate rock powder from a raw material workshop sufficiently reacts with excessive nitric acid of 60 percent in an acidolysis tank, acidolysis solution obtained by reaction sequentially enters a plurality of flocculating settling tanks 3 by a distributor 2; flocculating agent solution which is hydrolyzed in a flocculating agent configuration tank 4 is sequentially added into a plurality of flocculating settling tanks 3 according to a designed using amount; simultaneously, stirring paddles in the tanks sufficiently stir; clear solution and unseparated fine acid-insoluble substances along with the clear solution in the flocculating settling tanks enter a crystallization feeding trough 5 by an overflow pipe; the separated acid-insoluble substances enters a washing drum 6 by tank bhottom valves of the flocculating settling tanks to be subjected to subsequent treatment; and the flocculating settling separation process of the acid-insoluble substances can be alternately carried out among a plurality of flocculating settling tanks, so that the subsequent process is uninterruptedly carried out and the production continuity is implemented.

Description

technical field [0001] The invention belongs to the technical field of solid-liquid separation technology, and in particular relates to a technical process for separating acid-insoluble matter in nitrophosphate fertilizer production by using a chemical flocculation method. Background technique [0002] The separation of acid-insoluble matter is one of the most important problems in the field of nitrophosphate fertilizer production in the world today. This problem is particularly serious and prominent in the production of nitrophosphate fertilizers in my country. This is because although my country has abundant phosphate rock reserves, rich ore only accounts for a very small proportion, and more than 90% are medium and low-grade phosphate rock. Low and medium grade phosphate rock not only P 2 o 5 The content is low, and contains many kinds of impurities, especially the acid insoluble content is very high, the average is as high as 12% to 14%. [0003] The acid-insoluble ma...

AI Technical Summary

Problems solved by technology

Since during the flocculation process, the solution cannot have a large flow, so as not to re-crumble the large particles that have been agglomerated into small particles and become particles that cannot be precipitated. Therefore, this method requires acid hydrolysis during the flocculation process. The liquid has a standing time, resulting in a discontinuity in production

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